I am tardy, Sorry.
I have used clinch nuts and rivnut's. I bought a kit when the seating of my GPV rivnut's in the frame came loose. The aluminium nuts are much easier to use than the steel ones. I needed the ones for a 5mm screw, I did try stainless steel clinch nuts; first. Having then needing to make extension arms for the riveter as I just didn't have the strength to clinch the nut. So switched to aluminium nuts.
Then last year I purchased another clinch nut kit for imperial sizes as I needed a 1/4 UNC for a monopod attachment on an LED inspection light. But found all the mandrels the same as the metric kit
So after using the 6mm clinch nut, I rethreaded the clinch nut to 1/4 UNC